Golf club

Abstract

A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, a sleeve including a top portion, a middle portion connected to the top portion is described. The middle portion includes a thin wall thickness. A bottom portion is connected to the middle portion including a plurality of engaging surfaces. A central longitudinal axis and an offset angle offset from the central longitudinal axis is described. The offset angle allows a maximum loft change of about 0.5 degrees to about 4.0 degrees. The total weight of the sleeve is less than 9 g.

1. A golf club sleeve comprising:
 a top portion; 
 a middle portion connected to the top portion, the middle portion having a thin wall thickness of at least 0.35 mm to about 1 mm; 
 a bottom portion connected to the middle portion including a plurality of engaging surfaces; 
 a central longitudinal axis; and 
 an offset angle being offset from the central longitudinal axis, wherein the offset angle is configured to allow a maximum loft change of about 0.5 degrees to about 4.0 degrees by changing the rotational position of the sleeve within a hosel of a golf club, wherein the total weight of the sleeve is less than 9 g, wherein the bottom portion has a threaded bore for removably connecting the sleeve to a golf head. 
 
     
     
       2. The golf club sleeve of  claim 1 , wherein the total weight of the sleeve is between about 4 g and about 9 g. 
     
     
       3. The golf club sleeve of  claim 1 , wherein the total weight of the sleeve is between about 4 g and about 7 g. 
     
     
       4. The golf club sleeve of  claim 1 , wherein the total weight of the sleeve is between about 4 g and about 6 g. 
     
     
       5. The golf club sleeve of  claim 1 , wherein the total weight of the sleeve is between about 4 g and about 5 g. 
     
     
       6. The golf club sleeve of  claim 1 , wherein the middle portion includes a thin wall thickness of between about 0.6 mm and about 1 mm. 
     
     
       7. The golf club sleeve of  claim 1 , further comprising:
 a first engagement surface; 
 a second engagement surface; 
 a third engagement surface; and 
 a fourth engagement surface having a plurality of engaging splines, the first, second, third, and fourth engagements surfaces configured to engage a surface located on the hosel portion of a golf club head. 
 
     
     
       8. The golf club sleeve of  claim 7 , wherein the first engagement surface, the second engagement surface, the third engagement surface, and the fourth engagement surface are axi-symmetric about the central longitudinal axis. 
     
     
       9. The golf club sleeve of  claim 7 , wherein the third engagement surface is a ridge surface having a wide portion and a narrow portion configured to engage the interior wall of a hosel portion. 
     
     
       10. The golf club sleeve of  claim 1 , further comprising a first non-engagement region, a second non-engagement region, and a third non-engagement region, the non-engagement regions being axi-symmetric about the offset axis. 
     
     
       11. The golf club sleeve of  claim 1 , wherein the sleeve includes a plurality of markings that indicate the rotational position of the sleeve.